Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b211559b215eb33…

MALICIOUS

PDF

68.3 KB Created: 2020-08-31 10:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 949a63cc1bd74b275a8cda183db83c5b SHA-1: 7cbc1f1e41fcf2ea8895bd9330902247b3f13c07 SHA-256: 6b211559b215eb3379af5d0d8dd86e07a2cf9a5b7c044afaeebb860de55fbf4a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://ttraff.ru/wix?keyword=la+meta+eliyahu+goldratt+resumen+por+capitulos', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=la+meta+eliyahu+goldratt+resumen+por+capitulos
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2507/2282/files/waterfall_model_phases.pdf
    • https://cdn.shopify.com/s/files/1/0433/7375/6572/files/alternative_investment_criteria.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5671/files/chaubandi_choli_song.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1449/files/91913224165.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/gba_emulator_ios_9._0._2.pdf
    • https://cdn.shopify.com/s/files/1/0431/8288/2980/files/tongue_twister_activities.pdf
    • https://cdn.shopify.com/s/files/1/0430/6590/1210/files/cahier_de_texte_svt_college.pdf
    • https://cdn.shopify.com/s/files/1/0433/8666/7158/files/dod_biographical_sketch_template.pdf
    • https://static.usrfiles.com/ugd/63022f_c833beb8aa98423a966bdce28a5a6ca9.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_a0282037360845f393fc69c1afad778e.pdf
    • https://static.usrfiles.com/ugd/ae059d_3b2e249448df4961849cf5c40cc31568.pdf
    • https://static.usrfiles.com/ugd/b8c837_6938b56e0ada4c10b1e4f861b6c83288.pdf
    • https://static.usrfiles.com/ugd/05301a_c1774e815cc74285a43c54a4d78180e9.pdf
    • https://cdn.shopify.com/s/files/1/0438/6439/1845/files/89387736058.pdf
    • https://cdn.shopify.com/s/files/1/0432/8475/8696/files/weather_report_bayreuth_germany.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6149/files/6747108819.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c886.bin
a898deb694c1f780c53c6c3c857b22e73e97f5b053acbe4b7b89dd14d8056a35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC886 5528 bytes
font_01_sfnt_off0000db32.bin
84f4f328df495d908d19cf1605ea658a4c4fece65dec2a875db3ff79b667fe91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 12188 bytes

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